Mold

Active Publication Date: 2013-12-26
KAWASAKI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a mold that minimizes the occurrence of wrinkles in a laminate during curing. This is achieved by approximating the coefficient of thermal expansion of each partial surface die in a circumferential direction to the coefficient of thermal expansion of the core die.

Problems solved by technology

However, since the skin panel of a large aircraft has a considerably large diameter of 5 to 10 m, it is substantially impossible to perform molding with a single surface die.
However, in the case of constructing a mold with a plurality of partial surface dies, since a thermosetting resin temporarily exhibits a viscosity drop due to the heat at the time of curing a laminate, there is a problem that an edge of the partial surface die is pressed against the laminate, thereby intruding into the laminate.

Method used

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Embodiment Construction

[0023]Hereinafter, embodiments of a mold according to the present invention will be described with reference to the drawings. Hereinafter, throughout the drawings, the same or corresponding components are designated by the same reference numerals and repetitive description thereof will not be given.

[0024]First, an outline of a mold 100 according to the present embodiment is described with reference to FIGS. 1 and 2. The mold 100 according to the present embodiment is used for molding a skin panel of a fuselage of a large aircraft. The skin panel is assumed to have a cylindrical shape having a diameter of about 6 m and an axial length of about 7 m. FIG. 1 is a perspective view showing a state in which the mold 100 according to the present embodiment is being used. FIG. 2 is a cross-sectional view of a structure in which a surface die 20 according to the present embodiment is attached to a laminate 30. As shown in FIG. 1, the mold 100 according to the present embodiment includes a cor...

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Abstract

A mold (100) according to the present invention is a mold used when curing a cylindrical laminate (30) obtained by laminating prepreg. The mold (100) includes a core die (10) located inside the laminate (30) and a surface die (20) that is located outside the laminate (30) and includes a plurality of partial surface dies (21 to 27). The partial surface dies (21 to 27) are arranged in a circumferential direction of the laminate (30) so as to cover the entire circumferential surface of the laminate (30). Each of the partial surface dies (21 to 27) is made of a fiber-reinforced resin in which a quantity of fiber having a grain direction in agreement with the circumferential direction differs from a quantity of fiber having a grain direction in agreement with an axial direction. Each of the partial surface dies (21 to 27) is constructed so that a coefficient of thermal expansion in the circumferential direction approximates a coefficient of thermal expansion of the core die (10) as compared with a coefficient of thermal expansion in the axial direction.

Description

TECHNICAL FIELD[0001]The present invention relates to a mold used for manufacturing a composite material molded article.BACKGROUND ART[0002]A skin of a fuselage of an aircraft is constructed of a thin member called a skin panel (for example, refer to Patent Document 1). In recent years, a technology for integrally forming a broader skin panel than before with using fiber-reinforced resin composite materials (hereinafter, simply referred to as “composite materials”) has been developed. For example, even though a skin panel in the vicinity of the center of the fuselage of a large aircraft has a cylindrical shape, the technology integrally forms a seamless skin panel of a cylindrical shape.[0003]In order to manufacture the skin panel of a cylindrical shape described above, prepreg is laminated onto an outside surface of a cylindrical core die (generally called a “mandrel”), and the laminated prepreg (hereinafter, referred to as a “laminate”) has a cylindrical shape overall. “Prepreg” i...

Claims

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Application Information

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IPC IPC(8): B29C33/42
CPCB29C33/42B29C33/3828B29C33/40B29C33/48B29C70/42B29L2023/00B29L2031/3082Y10T29/49718Y10T428/249921B29C33/38B29C41/38
InventorSANA, TOSHIKAZU
OwnerKAWASAKI HEAVY IND LTD